Friday, April 17, 2009
*MID-OCEAN RIDGE*
These underwater mountain ranges are also the world's longest mountain range, which is over 40,000 MILES!!!
THE RING OF FIRE
~Pangea~
Pangaea
Did you know Pangaea, the old super continent, is now our seven split continents??? It was one huge land mass, that now turned into North America, South America, Africa, Europe, Asia, Antarctica and Australia. If you look carefully at the globe, you will see that the pieces of land actually fit really well together. For example, if you look at South American and Africa, they look like they could match just like puzzle pieces. It has been proved that it was once a huge continent, because on different parts of the world, fossils from different many animals have been found in totally different climates, on the parts of the continents that would have matched together. But just like how it moved apart and away a long time ago, it is still moving. The average movement of the plates is 1 cm. per year! It takes millions and millions of years to move these plates.
Friday, April 10, 2009
Plate Tectonics :]
There are many theories for Plate Tectonics. The theory encompasses the older concepts of continental drift. The theory is that the continents release earth's core, thus turning into the 7 continents, Africa, North America, South America, Australia, Antarctica, Europe and Asia.
The forces that cause the plates to move, are friction, gravity and external forces.
Here is a Video showing you the results from plate motions.
http://www.youtube.com/watch?v=2TVLUBRfHgM&feature=related
Thursday, April 9, 2009
Convergent and Divergent Boundaries
Convergent Boundaries
Convergent Boundaries create large mountain ranges. The Himalayas formed from a convergent boundary.
Divergent Boundaries
Divergent Boundaries create volcanic islands.